1887

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Volume 53, Issue 12

induces p44/p42 mitogen-activated protein kinase activation in human fibroblasts through Toll-like receptor 4 Free

Abstract

, an obligately intracellular Gram-negative bacterium and a common causative agent of respiratory tract infections, has been implicated in the induction and progression of atherosclerosis and coronary artery disease. In this study, the signalling mechanism of in human fibroblasts, a prominent cell population in chronic inflammation and persistent infection, contributing to plaque formation, was investigated. elementary bodies were demonstrated to up-regulate the phosphorylation of p44/p42 mitogen-activated protein kinase (MAPK) in human fibroblasts. The effect was independent of the chlamydial lipopolysaccharide and was likely to be mediated by a heat-labile chlamydial protein. Furthermore, an anti-Toll-like receptor 4 (TLR4) antibody was shown to abolish -induced cell activation, whereas an anti-TLR2 antibody had no effect, indicating the role of TLR4 in p44/p42 MAPK activation. Ca/calmodulin-dependent protein kinase inhibitor KN-62 and phosphodiesterase 4 (PDE 4) inhibitor Rolipram enhanced -induced MAPK phosphorylation and attenuated infectivity . Together the results indicate that triggers rapid TLR4-mediated p44/p42 MAPK activation in human fibroblasts and chemical enhancement of MAPK phosphorylation modulates infection at the molecular level.

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  • Accepted:
  • Published Online:
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2004-12-01
2024-04-19
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Chlamydophila pneumoniae induces p44/p42 mitogen-activated protein kinase activation in human fibroblasts through Toll-like receptor 4
J. Med. Microbiol. 53, 1187 (2004); https://doi.org/10.1099/jmm.0.45758-0
/content/journal/jmm/10.1099/jmm.0.45758-0
/content/journal/jmm/10.1099/jmm.0.45758-0
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